update the changes.md for upgrading MongoDB Java driver

[liferoad]

#35946 is the PR.

Tested this change with the SNAPSHOT run with Dataflow Templates: https://github.com/GoogleCloudPlatform/DataflowTemplates/actions/runs/17294873776/job/49090516119

Used this:
https://repository.apache.org/content/groups/snapshots/org/apache/beam/beam-sdks-java-io-mongodb/2.68.0-SNAPSHOT/beam-sdks-java-io-mongodb-2.68.0-20250828.122729-36.pom

The tests look green.

Fixes #35858

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[gemini-code-assist]

Summary of Changes

Hello @liferoad, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on updating the CHANGES.md file to document a significant upgrade of the MongoDB Java driver. The entry reflects the transition from version 3.12.11 to 5.5.0, which involved API refactoring and updates to GridFS implementations, ensuring the project's public change log is up-to-date.

Highlights

• Documentation Update: The CHANGES.md file has been updated to include a new entry.
• MongoDB Driver Upgrade Documentation: The new entry documents the upgrade of the MongoDB Java driver from version 3.12.11 to 5.5.0, noting API refactoring and GridFS implementation updates. This change was part of a separate pull request (#35946) and is now formally recorded in the project's change log.

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